CN102065556A - Uplink/downlink joint scheduling method of HSPA - Google Patents
Uplink/downlink joint scheduling method of HSPA Download PDFInfo
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Abstract
The invention discloses an uplink/downlink joint scheduling method of HSPA (high speed packet access). The method comprises the following steps: in the process of NodeB performing uplink/downlink transmission scheduling for UE (user equipment), if the UE has data to be sent in any direction and is allowed to be scheduled in the direction within the preset time but not scheduled, forbidding scheduling the UE on a service channel opposite to the direction until the UE is scheduled in the direction and successfully transmits data; and allowing scheduling the UE on the service channel opposite to the direction. By adopting the method disclosed by the invention, the data loss caused by RLC (radio link control) beyond window can be avoided, and the cell throughput is increased.
Description
Technical field
The present invention relates to the user's dispatching technique in the communication system, particularly a kind of high-speed packet inserts the up-downgoing combined scheduling method of (HSPA).
Background technology
In traditional HSPA scheduling, the uplink and downlink direction is dispatched independently of each other, calculates user's priority orders respectively, determines the user that each TTI dispatches according to priority, and dispatching algorithm does not have direct incidence relation in up-downgoing.
When the user after the reverse link traffic channel of HSUPA is scheduled, this dispatched users sends business datum by the reverse link traffic channel of scheduling to NodeB, after NodeB receives this business datum, the down control channel that utilizes HSUPA to UE feedback acknowledgment information, is proceeded follow-up data and is sent on rlc layer after the UE confirmation of receipt information; When the user after the downlink traffic channel of HSDPA is scheduled, NodeB sends business datum by the downlink traffic channel of scheduling to UE, after UE receives this business datum, the ascending control channel that utilizes HSDPA to NodeB feedback acknowledgment information, is proceeded follow-up data and is sent on rlc layer after the NodeB confirmation of receipt information.
But, in the present network environment, it is uneven that the reverse link traffic channel of HSUPA and the downlink traffic channel of HSDPA may cause HSUPA and HSDPA to cover because of interference level is different, occurs folk prescription easily to can normal consistency, but can not get in the other direction always dispatcher can situation.Under this unbalanced dispatch environment, the rlc layer of normal consistency direction is because can not get confirming data all the time, and the data before need repeating all the time to send, therefore very fast the accumulation to surpass to send the long data of window, be called the rlc layer exit window, cause loss of data thereby enter abnormality processing; Simultaneously, only the user of unidirectional normal consistency is scheduled on its normal consistency direction all the time, has also reduced two-way normal consistency user's dispatcher meeting, influences cell throughout.
The RLC exit window problem that causes at above-mentioned scheduling imbalance can obtain part by the TCP flow-control mechanism at present and solve.If the receive direction of TCP can not get dispatcher meeting always, then TCP can not receive feedback always, and therefore, the transmission speed that can progressively reduce TCP sending direction data is up to being zero; But this TCP Flow Control processing procedure is slow, reacting condition for channel is not prompt enough, too much data have been sent when TCP speed is adjusted to the right place by the time, still can cause RLC to send problems such as exit window, and in unidirectional scheduling process, taken too much scheduling resource, influence the up-downgoing throughput.
Summary of the invention
In view of this, the invention provides the up-downgoing combined scheduling method of a kind of HSPA, the loss of data that can avoid the RLC exit window to cause early.
For achieving the above object, the present invention adopts following technical scheme:
The up-downgoing combined scheduling method of a kind of HSPA comprises:
At NodeB is that UE carries out in the process of up-downgoing transmitting and scheduling, if described UE on either direction, exist on this either direction, allow to be scheduled in data to be sent and the Preset Time but do not obtain all the time the scheduling, forbid the described UE of scheduling on the opposite direction Traffic Channel of described either direction, on described either direction, obtain scheduling, also successfully transmit data up to UE, allow the described UE of scheduling on the opposite direction Traffic Channel of described either direction.
Preferably, the dispatch state kind that sets in advance UE comprises: uplink scheduling enable state, uplink scheduling illegal state, descending scheduling enable state and descending scheduling illegal state; Wherein, the uplink scheduling enable state represents to allow for the downlink traffic channel scheduling that described UE carries out HSDPA, the uplink scheduling illegal state represents to forbid carrying out for described UE the downlink traffic channel scheduling of HSDPA, the descending scheduling enable state represents to allow for the reverse link traffic channel scheduling that described UE carries out HSUPA, and the descending scheduling illegal state represents to forbid carrying out for described UE the reverse link traffic channel scheduling of HSUPA;
When described either direction is down direction:
Described UE on either direction, have data to send and Preset Time on this either direction, allow to be scheduled but do not obtain scheduling all the time, forbid that the described UE of scheduling is on the opposite direction Traffic Channel of described either direction:, then change described UE over to the descending scheduling illegal state when described UE is in the uplink scheduling enable state, exists data to be sent and a N continuous Transmission Time Interval TTI not to be scheduled at down direction; Described N is the positive integer of systemic presupposition;
Describedly on described either direction, obtain scheduling, and successfully transmit data up to UE, described UE is dispatched in permission on the opposite direction Traffic Channel of described either direction: be scheduled on down direction up to this UE, and when described NodeB determines that UE successfully receives downlink data, change described UE over to the descending scheduling enable state;
When described either direction is up direction:
Described UE on either direction, have data to send and Preset Time on this either direction, allow to be scheduled but do not obtain scheduling all the time, forbid on the opposite direction Traffic Channel of described either direction the scheduling described UE be: when described UE be in the descending scheduling enable state, when up direction exists data to be sent and a N continuous Transmission Time Interval TTI not to be scheduled, change described UE over to the uplink scheduling illegal state;
Describedly on described either direction, obtain scheduling, and successfully transmit data up to UE, described UE is dispatched in permission on the opposite direction Traffic Channel of described either direction: be scheduled on up direction up to described UE, and when described NodeB correctly receives the upstream data of UE transmission, change described UE over to the uplink scheduling enable state.
Preferably, when the HSPA of described UE business is set up, the up-downgoing Traffic Channel scheduling that allows to carry out described UE is set.
Preferably, according to the reaction speed requirement that scheduling interval requires and system handles the rlc layer exit window of normal transmission data, described Preset Time is set in advance.
Preferably, when adopting the PF dispatching algorithm, described Preset Time is greater than the largest interval in the PF dispatching algorithm.
Preferably, after entering uplink scheduling illegal state or descending scheduling illegal state, described UE starts default timer, if the described UE of timer expiry still is in uplink scheduling illegal state or descending scheduling illegal state, then force to carry out uplink scheduling or descending scheduling.
As seen from the above technical solution, among the present invention, at NodeB is that UE carries out in the process of up-downgoing transmitting and scheduling, if UE on either direction, exist on this direction, allow to be scheduled in data to be sent and the Preset Time but do not obtain all the time the scheduling, forbid on the opposite direction Traffic Channel of this direction, dispatching UE, on this direction, obtain scheduling, also successfully transmit data up to UE, allow on the opposite direction Traffic Channel of this direction, to dispatch UE.Through above-mentioned processing, when UE folk prescription occurs in the time can't obtaining dispatching for a long time, can stop the situation of folk prescription early to scheduling, avoid the loss of data that causes owing to the rlc layer exit window; After the scheduling that recovers on the direction that can not get dispatching at UE UE, proceed the normal consistency of up-downgoing again.
Description of drawings
Fig. 1 is the dispatch state transition diagram of UE.
Fig. 2 is the schematic diagram of example one of the present invention.
Fig. 3 is the schematic diagram of example two of the present invention.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, the present invention is described in further details below in conjunction with accompanying drawing.
Among the present invention, at NodeB is that UE carries out in the process of up-downgoing transmitting and scheduling, if UE on either direction, exist on this either direction, allow to be scheduled in data to be sent and the Preset Time but do not obtain all the time the scheduling, forbid on the opposite direction Traffic Channel of described either direction, dispatching UE, on this either direction, obtain scheduling, also successfully transmit data up to UE, allow on the opposite direction Traffic Channel of this either direction, to dispatch UE.
Wherein, during the restriction of dispatching on carrying out certain direction, only the scheduling to the Traffic Channel on this direction limits, and control channel on this direction is not limited.
Particularly, if the UE descending scheduling is normal, but (this upstream data can be a business datum upstream data, also can be signaling data) when but can not get dispatching always, forbid carrying out the downlink traffic channel scheduling of HSDPA for UE, make it on down direction, no longer send business datum, thus loss of data and the scheduling resource waste of avoiding the rlc layer exit window to cause; But for the down control channel of HSUPA, still can normal consistency, thus guarantee the reverse link traffic channel scheduling of HSUPA in case recover normal, can be by the normal feedback acknowledgment information of down control channel of HSUPA, guaranteeing that transfer of data is unobstructed carries out.
In like manner, if the UE uplink scheduling is normal, but (this downlink data can be a business datum downlink data, also can be signaling data) when but can not get dispatching always, forbid carrying out the reverse link traffic channel scheduling of HSUPA for UE, make it on up direction, no longer send business datum, thus loss of data and the scheduling resource waste of avoiding the rlc layer exit window to cause; But for the ascending control channel of HSDPA, still can normal consistency, thus guarantee the downlink traffic channel scheduling of HSDPA in case recover normal, can be by the normal feedback acknowledgment information of down control channel of HSDPA, guaranteeing that transfer of data is smooth and easy carries out.
When whether specific implementation up-downgoing Traffic Channel allows to dispatch, can carry out mark by forms such as flag bit or status indicators, thereby according to the scheduling of marking of control to UE.
Next, the present invention thinks that the mode that UE is provided with multiple dispatch state is an example, by specific embodiment specific implementation of the present invention is described.
Embodiment:
Set in advance the multiple dispatch state of UE,, specifically comprise for each HSPA user's up-downgoing defines scheduling enable state and scheduling illegal state respectively:
1) uplink scheduling enable state, expression allow for UE and carry out the scheduling of HSDPA downlink traffic channel;
2) uplink scheduling illegal state, expression are forbidden carrying out the scheduling of HSDPA downlink traffic channel for UE;
3) descending scheduling enable state, expression allow for UE and carry out the scheduling of HSUPA reverse link traffic channel;
4) descending scheduling illegal state, expression are forbidden carrying out the scheduling of HSUPA reverse link traffic channel for UE.
Dispatch unbalanced problem for the control up-downlink direction, when satisfying certain condition, between various states, shift, thereby whether control allows the scheduling of Traffic Channel.Particularly, the jump condition under the various states is:
A, enter descending scheduling enable state condition, satisfy wherein one and get final product:
1) HSPA is professional sets up
2) on down direction, be scheduled, and NodeB determines that UE successfully receives downlink data;
Wherein, NodeB determines that UE successfully receives downlink data, after promptly UE successfully receives downlink data, to NodeB feedback acknowledgment information, and NodeB receives this confirmation, here, because before satisfying this condition, UE necessarily is in the descending scheduling illegal state, just forbid carrying out the reverse link traffic channel scheduling of HSUPA for UE, but the ascending control channel of HSDPA scheduling remains and is allowed to, so UE can be by the ascending control channel of HSDPA, normally to NodeB feedback acknowledgment information.
B, enter descending scheduling illegal state condition:
UE is in the uplink scheduling enable state, and UE has at down direction that a N continuous TTI is not scheduled under the situation that data will send, and wherein N is pre-configured positive integer;
Here, UE is in the uplink scheduling enable state, then mean and allow for the descending scheduling that UE carries out HSDPA, that is to say, carry out downlink traffic channel when scheduling allowing for UE, UE has downlink data (may be that business datum also may be a signaling data) to send, but never obtain scheduling, the scheduling existing problems of this down direction are described, need carry out dispatch state and shift, thereby the control up direction is also forbidden the scheduling of Traffic Channel, with the loss of data of avoiding causing by the rlc layer exit window, and, improve cell throughout for the user of other two-way normal consistencies provides more dispatcher meeting;
Wherein, about the configuration of the value of N, on the one hand can not be low excessively, if be lower than the scheduling interval of normal transmission, then may cause misoperation, promptly also arrive the scheduling time next time of UE, so UE obtains dispatching, and be this direction the scheduling of UE is not gone wrong; On the other hand can not be too high, otherwise the reaction of handling for the rlc layer exit window is slow excessively, cause multidata accumulation and caused loss of data, promptly occur and the identical problem of existing TCP Flow Control.Based on above-mentioned analysis, among the present invention,, the value of N is set according to the reaction speed requirement that scheduling interval requires and system handles the rlc layer exit window of normal data transfer.
For example, when adopting the PF dispatching algorithm, can be set to greater than the largest interval in the PF dispatching algorithm by N, and get minimum value, to carry out reciprocal scheduling controlling early greater than largest interval.C, enter uplink scheduling enable state condition, satisfy wherein one and get final product:
1) HSPA is professional sets up
2) on up direction, be scheduled, and NodeB successfully receives the upstream data that UE sends.
D, enter uplink scheduling illegal state condition:
UE is in the descending scheduling enable state, and UE has at up direction that a N continuous TTI is not scheduled under the situation that data will send, and wherein N is pre-configured positive integer;
Here, UE is in the descending scheduling enable state, then mean and allow for the uplink scheduling that UE carries out HSUPA, that is to say, carry out reverse link traffic channel when scheduling allowing for UE, UE has upstream data (may be that business datum also may be a signaling data) to send, but never obtain scheduling, the scheduling existing problems of this up direction are described, need carry out dispatch state and shift, thereby the control down direction is forbidden the scheduling of Traffic Channel, with the loss of data of avoiding causing by the rlc layer exit window, and, improve cell throughout for the user of other two-way normal consistencies provides more dispatcher meeting.
Wherein, the value of N disposes as hereinbefore, just repeats no more here.
Through after above-mentioned the setting, carrying out for UE in the process of up-downgoing transmitting and scheduling, just can carry out the control of up-downgoing scheduling according to the current state of UE.When UE is in the uplink scheduling illegal state, forbid carrying out the downlink traffic channel scheduling of HSDPA for this UE, after UE changes the uplink scheduling enable state over to, just allow for the downlink traffic channel scheduling that this UE carries out HSDPA; When UE is in the descending scheduling illegal state, forbid carrying out the reverse link traffic channel scheduling of HSUPA for this UE, after UE enters the descending scheduling enable state, just allow for the reverse link traffic channel scheduling that this UE carries out HSUPA.
By the jump condition between above-mentioned each state as seen, through after above-mentioned the setting, the combinations of states of UE have three kinds may: uplink scheduling permissions/descending scheduling enable state, uplink scheduling forbid/descending scheduling enable state, uplink scheduling permission/descending scheduling illegal state, can not exist up-downgoing to dispatch the state of forbidding simultaneously.By the jump condition between above-mentioned state as seen, when the HSPA business was set up, the initial pool state of UE was a uplink scheduling permission/descending scheduling enable state, since then, the up-downgoing scheduling is monitored always, after satisfying specified conditions, between three kinds of assembled state, change.Concrete by the transformational relation between three kinds of assembled state of the explanation of the state transition diagram among Fig. 1, the condition A among Fig. 1, B, C, D are the several corresponding conditionses in the aforementioned literary composition.
Below by the processing of two concrete example explanation embodiment of the invention and the effect that reaches thereof.
Fig. 2 is the schematic diagram of example one.Wherein, in the HSPA area of coverage, the up strong jamming that directivity occurs, UE2 is subjected to than strong jamming up, cause uply can't satisfying schedulable condition for a long time, enter the uplink scheduling illegal state, stop descending scheduling, UE1 is not owing to be interfered, the up scheduling enable state that is in, because UE2 stops descending scheduling, the descending scheduling number of times of UE1 increases, speed raises fast, and cell throughout also can increase.
Fig. 3 is the schematic diagram of example two.Wherein, because the HSUPA Interference Control is relatively stricter, so the coverage of HSUPA is less than the coverage of HSDPA.UE2 leaves the area of coverage that still is in HSDPA behind the area of coverage of HSUPA, descendingly still dispatches normally, but does not uply satisfy schedulable condition, enters the uplink scheduling illegal state very soon, stops the scheduling of downlink data.UE1 is in the area of coverage of HSDPA and HSUPA, the provisional capital is in the scheduling enable state up and down, can dispatch normally, and can be because the stopping descending scheduling and can obtain more descending scheduling chance of UE1, obtain higher throughput, cell throughout also can increase.
By as seen above-mentioned, by the present invention, the loss of data that can avoid the RLC exit window to cause, part solves because the up-downgoing that cause of failures causes covers imbalance problem, reduce folk prescription and forbid user's opposite direction scheduling times to scheduling, can give other normal users with dispatcher, thereby increase cell throughout.
In addition, following situation may occur: folk prescription is gone up scheduling to (hereinafter referred to as direction A) and is occurred unusually, thereby forbids the reciprocal Traffic Channel scheduling of UE; When making by situations such as disturbing disappearance unusual dispatching party appears after the scheduling feature of having recovered on the A UE, this UE does not have data to send on direction A, NodeB still can not dispatch UE on direction A, at this moment, because scheduling does not take place and the data transmission on direction A, therefore NodeB can not change the dispatch state of UE, still can the opposite direction of disabled orientation A on the scheduling of Traffic Channel, influence the proper communication of UE.
For example, the uplink scheduling of UE is unusual, and NodeB forbids the downlink traffic channel scheduling to this UE, supposes that this UE is carrying out down operation, and then downloading service stops; Behind the uplink scheduling functional rehabilitation of NodeB to UE, because UE do not have uplink service to carry out, so NodeB can not carry out uplink scheduling to it, so downloading service is in halted state always.
Obviously, above-mentioned situation is that the user is undesirable, under the circumstances, among the present invention further, after UE enters the uplink scheduling illegal state, can start a default timer immediately, if timer expiry, this UE still is in the uplink scheduling illegal state, then forces to carry out one time uplink scheduling; Similarly, after UE enters the descending scheduling illegal state, can start a default timer immediately, during as if timer expiry, this UE still is in the descending scheduling illegal state, then forces to carry out one time descending scheduling.
Through after the above-mentioned processing, by the scheduling of first power on A of forcing to carry out, make the scheduling enable state of user's approach axis A, thus can the rightabout scheduling of travel direction A, avoid because direction A goes up the foregoing problems that the free of data transmission causes; If after this, all the time can normal consistency, then maintain the scheduling enable state of direction A always, if still have data to send on the direction A but be not scheduled, the scheduling illegal state of approach axis A once more.
Being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the up-downgoing combined scheduling method of a HSPA is characterized in that, this method comprises:
At NodeB is that UE carries out in the process of up-downgoing transmitting and scheduling, if described UE on either direction, exist on this either direction, allow to be scheduled in data to be sent and the Preset Time but do not obtain all the time the scheduling, forbid the described UE of scheduling on the opposite direction Traffic Channel of described either direction, on described either direction, obtain scheduling, also successfully transmit data up to UE, allow the described UE of scheduling on the opposite direction Traffic Channel of described either direction.
2. method according to claim 1 is characterized in that, the dispatch state kind that sets in advance UE comprises: uplink scheduling enable state, uplink scheduling illegal state, descending scheduling enable state and descending scheduling illegal state; Wherein, the uplink scheduling enable state represents to allow for the downlink traffic channel scheduling that described UE carries out HSDPA, the uplink scheduling illegal state represents to forbid carrying out for described UE the downlink traffic channel scheduling of HSDPA, the descending scheduling enable state represents to allow for the reverse link traffic channel scheduling that described UE carries out HSUPA, and the descending scheduling illegal state represents to forbid carrying out for described UE the reverse link traffic channel scheduling of HSUPA;
When described either direction is down direction:
Described UE on either direction, have data to send and Preset Time on this either direction, allow to be scheduled but do not obtain scheduling all the time, forbid that the described UE of scheduling is on the opposite direction Traffic Channel of described either direction:, then change described UE over to the descending scheduling illegal state when described UE is in the uplink scheduling enable state, exists data to be sent and a N continuous Transmission Time Interval TTI not to be scheduled at down direction; Described N is the positive integer of systemic presupposition;
Describedly on described either direction, obtain scheduling, and successfully transmit data up to UE, described UE is dispatched in permission on the opposite direction Traffic Channel of described either direction: be scheduled on down direction up to this UE, and when described NodeB determines that UE successfully receives downlink data, change described UE over to the descending scheduling enable state;
When described either direction is up direction:
Described UE on either direction, have data to send and Preset Time on this either direction, allow to be scheduled but do not obtain scheduling all the time, forbid on the opposite direction Traffic Channel of described either direction the scheduling described UE be: when described UE be in the descending scheduling enable state, when up direction exists data to be sent and a N continuous Transmission Time Interval TTI not to be scheduled, change described UE over to the uplink scheduling illegal state;
Describedly on described either direction, obtain scheduling, and successfully transmit data up to UE, described UE is dispatched in permission on the opposite direction Traffic Channel of described either direction: be scheduled on up direction up to described UE, and when described NodeB correctly receives the upstream data of UE transmission, change described UE over to the uplink scheduling enable state.
3. method according to claim 1 and 2 is characterized in that, when the HSPA of described UE business is set up, the up-downgoing Traffic Channel scheduling that allows to carry out described UE is set.
4. method according to claim 1 and 2 is characterized in that, according to the reaction speed requirement that scheduling interval requires and system handles the rlc layer exit window of normal transmission data, described Preset Time is set in advance.
5. method according to claim 4 is characterized in that, when adopting the PF dispatching algorithm, described Preset Time is greater than the largest interval in the PF dispatching algorithm.
6. method according to claim 2, it is characterized in that, after entering uplink scheduling illegal state or descending scheduling illegal state, described UE starts default timer, if the described UE of timer expiry still is in uplink scheduling illegal state or descending scheduling illegal state, then force to carry out uplink scheduling or descending scheduling.
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